Montgomery has a special/new skill that people will be talking about, which no other runner really does - at least as much or as well... the coil and spring effect is what sets his contact balance apart. Just as in the highlight from TC. He compresses his body both down from the head/shoulders and up form the hips legs causing a coil effect to his body. Then when he gets contact this causes him to naturally act like a spring.. bouncing off the contact but also becoming stiff and solid in his new position, while also bouncing the tackler off him.. Just imagine a compressed spring exploding.
Most runners just lower their shoulder and keep driving their feet, this is how most Defensive players are used to taking/giving contact when tackling.
This skill will end up being copied and mimicked just like the Peanut Punch was, it will make Montgomery different and special to a certain extent.